Hopper-To-Prepunch Bed Service Checks; Pressure Rail Adjustments - IBM 29 Card Punch Field Engineering Maintenance Manual

Yoke Adjusting Screws
Armature
Spring
230 to 250
Grams
A
100 to 120
Grams
Figure 4-4. CF Clutch Magnet Adjustment
Magnet Unit
Mounting Screws
0.010"to 0.014"
Unlatched
Armature
Rachet
Clutch Latch Disk
Figure 4-5. CF Clutch Adjustment
3. Turn backstop screw two full turns counterclockwise
and lock.
4.5.3.2 Mounting Plate Assembly
1. Provide 3/64-inch (0.047-inch) clearance from latch
magnet armature to ear on CF cam follower arm (Figure
4-6).
2. At same time, position assembly vertically to provide
0.005-inch to 0.017-inch latching clearance from cam
follower arm to armature tip when armatureis attracted.
Armature
/ Back Stop Screw
Bracket
Mounting
Screws
Magnet
Mounting
Screws
lt wV
Card Feed Cam 0.005" to 0.017"
Follower Arm — ~< 0.047"
Figure 4-6. CF Latch Magnet Adjustment
4.5.4 Hopper-to-Prepunch Bed Service Checks
4.5.4.1 Card Feed Pressure Roll Service Check
Check for even drag on a card inserted lengthwise down
either side. Rollers should be free of binds, and the two flat
springs should be straight when removed from machine.
Misalignment or uneven tension on pressure roll bar may
cause uneven feeding of cards.
4.5.4.2 Aligner Finger Service Check
Factory adjustment for the card aligner fingers is 0.035-
inch to 0.055-inch movement ahead of top card rail. The
card must snap off the card aligner fingers and drop into
position along the top rail before registration. Otherwise,
the first 15 columns may be in-registration and the rest of
the card may beoff-registration to theleft.
4.5.5 Pressure Rail Adjustments
When making the following adjustments, hold the gram
gage as shown in Figure 4-7. In this position, gram gage
reading and pressure rail movement can be simultaneously
observed.
4.5.5.7 Pressure Rail Without Contact
Form pressure rail spring in detail station to exert 23-gram
to 3l-gram (12-gram to 20-gram for master station)
pressure on a registered card. Check tension necessary to
move rail away from card evenly.
4.5.5.2 Pressure Rail With Strap Contact
1. Remove card lever contact assembly from machine and
straighten stationary strap.
29 FEMM (4/69) 4-5